Institute for Transportation

Using proof loads and safety factors developed
according to recently accepted AASHTO
procedures, it is demonstrated that a closed timber
structure can safely carry 3 tons and thus be
reopened. A literature survey was conducted to
provide information that was synthesized into a
strategy for proof loading closed timber bridges. The
resulting strategy applies the concept of structural
shakedown to the rating of timber bridges. Load
tests and material tests were conducted.